Recently added, shop sorting, and outfit cards with T5 products

- The inventory's Recently Added puts T5 products added to the library in the last 30 days first.
- The shop's T5 listing follows its sort menu: Best Match ranks by name, Newest by upload date
  (oldest first ascending); ratings and prices (T5 products have neither) sort by newest.
- Outfit cards: outfit_products.php gets the outfit's community products added (not for sale),
  find_bundle.php is asked about IMVU's products only, and removing one in the card (remove_pids)
  keeps it from IMVU and forgets it in the outfit.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

internal/hub/hub.go

@@ -463,11 +463,9 @@ type Files struct {
 
 // LibraryEntry is a product in the person's library.
 type LibraryEntry struct {
-	Product struct {
-		ID   string `json:"id"`
-		Name string `json:"name"`
-	} `json:"product"`
-	StayOn *int `json:"stayOn"`
+	Product Product   `json:"product"`
+	StayOn  *int      `json:"stayOn"`
+	AddedAt time.Time `json:"addedAt"`
 }
 
 // Library is the person's library.
@@ -503,6 +501,7 @@ type Product struct {
 	Parent     int64      `json:"parent"`
 	Image      string     `json:"image"`
 	Categories []Category `json:"categories"` // the parent's IMVU category path, top first
+	CreatedAt  time.Time  `json:"createdAt"`
 }
 
 // Category is an IMVU shop category.